ArgoUML is a pure Java open source UML CASE tool that provides cognitive support for object-oriented design. ArgoUML provides some of the same editing and code generation features of a commercial CASE tool, but it focuses on features that enhance usability and support the cognitive needs of designers. Uses XML file formats: XMI and PGML.
HappyDoc is a tool for extracting documentation from Python source code. It differs from other such applications by the fact that it uses the parse tree for a module to derive the information used in its output instead of importing the module directly. This allows the user to generate documentation for modules which need special context to be imported.
Crocsdb is a frontend to Jade and a variety of utilities that allows the EASY creation of multiple document formats (html, pdf, etc.) from a single SGML source. All you need to do is give the script one argument - the name of your SGML file. Links and documentation for the installation of DocBook and related utilities are included.
Multivalent Browser is a utility that natively views scanned paper, PDF, HTML, UNIX manual pages, and TeX DVI. The browser supports in situ annotations such as hyperlinks, highlights, notes, and executable copy editor markup on any of these formats. It boasts advanced features such as lenses and robust locations. For developers, Multivalent has an API for extensions, and the document viewers can be embedded in Java Swing-based applications.